Right-angle-triangle letter-sheet envelop.



PATBLITED MAY 1 4,' 1907. A. B. meow.

RIGHT ANGLE TRIANGLE LETTER. SHEET BNVELOP.

APPLICATION FILED-1030.17. 1906. v

' Jnverdmr THE ucwms PETERS co., wnsramcrou, p. c.

UNITED STAT FS FTENT @FFTQE.

I RIGHT-ANGLE-TRIANGLE LETTER-SHEET ENVELOP.

Specification of Letters Patent.

Patented May 14, 1907.

Application filed l Jecember .17, 1906. Serial No. 348,120.

To aZ/Z whom, it nut l concern.

Be it known that I, ABNER B. MAGoUN, a citizen of the United States, residing at Brant Rock, in the county of Plymouth and State of Massachusetts, have invented new and useful Improvements in Right-Angle- Triangle Letter-Sheet Envelops, of which the following is a specification.-

This invention relates to an improved envelop and the method of folding a rectangular sheet of paper to form said envelop, the final folding of said sheet producing a right angle triangle letter sheet envelop.

The invention consists in a right angle triangle letter sheet envelop formed as described in the following specification and particularly as pointed out in the claims thereof and in the method of folding a rectangular sheet of paper to form said envelop.

Referring to the drawings: Figure 1 is a plan view of a rectangular sheet of paper from which my improved envelop may be formed. Fig. 2 is a plan view showing the sheet folded transversely thereof midway between its ends. Fig. 3 is a plan view showing the two lower corners folded at an angle of 45. Fig. 4 is a plan view showing the two upper corners of the front portion of the, doubled sheet folded at an angle of 45. Fig. 5 is a plan view illustrating the doubled portion folded again transversely thereof midway between its ends. Fig. 6 shows the completed envelop with the two upper corners of the rear portion of said doubled sheet folded at an angle of 45. Fig. 7 shows the front face of the envelop after the same has been folded, as shown in Fig. 6.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, 20 is a rectangular sheet. of paper perforated midway of its ends at 8 and 14 and upon the opposite sides thereof at 912 and 1013, respectively. The perforations 9 and 10 are located at one-quarter of the total length of the sheet from the bottom thereof. The perforations 12 and 13 are located at onequarter of the length of the sheet from the top thereof. A perforation 11 is located in the center of the sheet.

The method of folding the rectangular sheet 20 to forma right angle triangle envelop sheet is as follows; First, it is folded transversely thereof along the line 21-22, said line being located midway between the upper and lower ends of the sheet, thus forming the sheet into 'a double sheet, as illustrated in Fig. 2; second, the twolower corners 2122 of the doubled sheet are brought together and the doubled sheet folded along the lines 119 and. 11-10 at angles of 45 from the center of its lower end to the center of its opposite sides, thus forming the sheet as illustrated in Fig. 3; third,the two upper corners 15 and 16 of the front portion of the doubled sheet are brought together and said front portion of said doubled sheet is folded at angles of 45 from the center of its opposite sides to the center of its upper end, or along the lines 810 and 8-9, as illustrated in Fig. 4; fourth, the doubled portion of said sheet is folded transversely thereof midway between its ends along the lines 910 and 1213, as illustrated in Fig. 5; and finally the two upper corners 17 and 18 of the rear portion of said doubled sheet are brought together and said rear portion is folded at angles of 45 from the center of its opposite sides to the center of its upper end or along the lines 12-14 and 1314, thus forming the envelop as illustrated in Fig. 6.

The corners 17 and 18 are provided with adhesive material 19 by means of which said corners may be attached to the rear portion of the envelop when completely folded, as illustrated in Fig. 6. The upper corners of the rectangular sheet 20 are provided with perforations, 23, 23 extending at an angle across said corners at the upper end of the sheet 20. It will be noted that in the method of folding the sheet 20 hereinbefore described that said sheet is folded a plurality of times transversely thereof and is also folded along lines extending at 45 to the sides thereof, forming when completed a right angle triangle, said perforated corners being the last portions of said sheet which are folded at angles of 45 and adapted to be attached to the rear face of said envelop. When so attached the envelop may be opened by severing the corners 17 and 18 along the lines of perforations 23, 23.

, It is evident that instead of employing the perforations 8, 9, 10, 11, 12, 13 and 14, marks such as half circles or dots may be printed upon the surface of the paper in the same location as said perforations without departing from the spirit of my invention, said marks serving the purpose of assisting the user in folding the sheet 20 along the proper lines to produce the right angle triangle envelop of my invention.

Having thus described my invention, what ICC sheet, said sheet folded a I claim and desire cure is:

1. A right angle triangle letter sheet envelop consisting of a rectangular sheet of paper folded first, transversely thereof midway between its ends, second, the two lower corners thereof brought together and the doubled sheet folded at angles of 45 from the center of its opposite sides to the center of its lower end, third, the two upper corners of the front portion of said doubled sheet brought together and the front portion of said doubled sheet folded at angles of 45 from the center of its opposite sides to the center of its upper end, fourth, said doubled portion of said sheet folded transversely thereof midway between its ends, and fifth, the two upper corners of the rear portion of said doubled sheet brought together and the rear portion of said doubled sheet folded at angles of 45 from the center of its opposite sides to the center of its upper end, over upon the rear face of said envelop, the completed envelop forming in outline a right an gle triangle.

2. A right angle triangle letter sheet en velop consisting of a rectangular sheet of paper provided with perforations extending at an angle across two corners at one end of said plurality of times transversely thereof and along lines extending at 45 to the sides thereof, forming when completed a ri ht angle triangle, said perforated corners being the last portions of said by Letters Patent to seadapted to the center of its opposite sides to the center of its lower end, third, then. bringing the two upper corners of the front portion of said doubled sheet together and folding the front portion of said doubled sheet at angles of 45 from the center of its opposite sides to the center of its upper end, fourth, folding said doubled portion transversely thereof 1nidway between its ends, and. finally bringing the two upper corners of said doubled sheet together and folding the rear portion of said doubled sheet at angles of 45 from the center of its opposite sides to the center of its upper end and over upon the rear face of said sheet, whereby a right angle triangle letter sheet envelop is constructed.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ABNER B. MAGOUN.

itnesses CHARLES S. GoomNG, ANNIE J. DAILEY. 

